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25
2026
-
02
Analysis and Application of Motor Bearing Components
Motor bearings are the “joints” of the motor; component design, materials, bearing type, selection, and installation and maintenance all collectively determine motor performance.
Key Considerations for Motor Bearing Selection
Selection must comprehensively consider five key factors: load, rotational speed, precision, operating environment, and installation.
1. Load Type
Pure radial: deep-groove ball bearings, cylindrical roller bearings.
Radial plus axial: angular-contact ball bearings, self-aligning roller bearings.
Pure axial: thrust bearing.
Heavy-load, low-speed applications: roller bearings; light-load, high-speed applications: ball bearings.
2. Rotational Speed and Precision
High-speed applications (>3,000 rpm): Select low-friction ball bearings, small sizes, and precision grades (P5/P4).
Precision positioning (servo/spindle): paired angular-contact ball bearings with preload-controlled clearance.
3. Environmental and Special Requirements
Dust / Moisture: Select sealed type (ZZ/2RS).
Variable-frequency motor: Select insulated bearings (with a ceramic coating on the outer ring) to prevent shaft current from causing pitting and erosion of the raceways.
High temperatures: Select high-temperature grease (such as fluorinated grease) and metal cages.
4. Installation and Alignment
Shaft/bearing misalignment: self-aligning bearings.
Thermal expansion: Select bearings that allow axial float, such as NU-type cylindrical roller bearings.
Motor bearings are the “joints” of the motor; component design, materials, bearing type, selection, and installation and maintenance all jointly determine motor performance. Deep-groove ball bearings are the universal first choice; angular-contact and cylindrical roller bearings are suited to high-speed and heavy-load applications; insulated and self-aligning bearings are tailored for special operating conditions. Only by precisely matching the load, speed, and operating environment can the motor achieve efficient operation and long service life.
Related Information
2026-02-23
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